NOTE the circumcised penis does NOT enter the pee hole of the uncircumcised penis, merely shares the forskin with the uncirumcised penis.
The two guys have sex with the girl at the same time, one penis is inserted into the vagina, while the other is anal.
Derived from the "double-headed dolpin", where a hand is used instead.
Guy #2: "Oh man, it was insane! we gave her the double dolphin. She totally squealed."
Guy #1: "Nice!"